Drill-chuck



H. B. SHREVE.

DRILL CHUCK.

APPLICATION FILED JAN. 5| 1917.

1,385,501. j Patentedmy 26,1921.

UNITED s 'ifivrrsl PATENT OFFICE- 1 HARRY B. SIIREVE, or CHICAGO,v ILLINOIS, AssICNoR" To Loviizr'oYy TOOL WORKS, or

, CHICAGO, ILLINOIS, A CORPORATION or ILLINOIS...l

DRILL-CHUCK.

To all whom it may con/cem y i 1 Be it known that I, HARRY B. Siiiinvma citizen of the `United States,l residing in Chicago, in the county of Cook and `State of Illinois, have invented a new and'useful Improvement in Drill-Chucks, of which the following is a specication. f

This invention relates in general t0 chucks for drills and the like and has more particular reference to chucks of the general character described in Patent No. 1079520, granted to me on November 25, 1918, for im rovement in chucks.

X principal object of this invention is the provision of a chuck adapted .tohold firmly a drillV or similar tool in position which will cause it to project a definite distance from the chuck and this without' regard to the length of the drill.

My present invention has Ia valuable use in portable drilling apparatus, vs uch as apparatus for drilling railroad rails `and the like. In apparatus for this character the movement of the chuck which holds the drill is necessarily limited, and itis particularly desirable that drills extend from the chuck a desired predetermined distance. Breaking off the end of thedrilland frequent sharpening cause it to become materially shorter with use, and this invention aims to compensate forl this continued shortening 'throughthe provision ofl simple and readily operated means for adJusting the position of the drill in the chuck.

A further object of the invention is the provision 'of suoli a structure having sensitive adjustment. y

Other objects and advantages of the invention will be apparent as it is better understood from the following description when considered in connection with the accompanying drawing illustrating a preferred embodiment thereof.

On the drawing,

Figure 1 is a perspective view of a chuck and tool embodying my invention;

Fig. 2 is a section taken substantially on the line 2 2 of Fig. 1;

Fig. 3 is a section taken substantially on the line 3-3 of Fig. 1; and

Fig. 4 is a section taken on the line 4 4 Of Fig. 2. l

Specification of Letters Patent.

Application led January 5, 1917.7: Serial No. 140,660.

Patented July 2e, 1921-.

For the purpose ofV illustrating ymy in;

vention I have shown on the drawing va l chuck generally designated at A embodying my invention and carrying a drill .The chuck A comprisesI a head 11 provided with-an axial bore '12 and carrying a shank 13 of any usual or vpreferred. construction. yThevhead A is provided with a pair of oppositely disposed slots 14 extending longitudinally of `the head from ladjacent the shank to its threaded portion 15 on which the usual holding cap 16 Vis provided to force the dogs 17 into engagementl with the drill when the latter is in place. 'A stop block 18 is' mountedto move axially of the head and is of substantially 'cylindrical form. through Which'a stop pin 21 extends. The stop pin and stop block constitute l what may be termed a stop against which kthe inner end of the drill bit rests.. rThe pin 21 extends throughthe slots and its ends 22 This block has an aperture 19 the collar is moved axially of the lieadand I permits independent rotary movement of the collar. IVhen it isY desired to .f adjust: the chuck the stop is moved axiallyof thehead through axial movement of the eollarthe desired distance, and then the collar is turned about the axis of the chuck to lock it in place. This turning movement causes interrupted screw threads 25 within the collar to engage interrupted screw threads 26 on the outer face of the head. In the present instance the threads on both parts are interrupted at two opposite locations throughout a distance equal to slightly more than a quarter of a circumference at each location. The collar may be turned to bring its threads clear of the threads of the chuck body in order that axial movement of the collar and stop may be accomplished. A pair of stops 27 are provided through the collar and extend across the slot 23 to limit the rotary movement of the collar so that movement in one direction will bring a stop 27 in engagement with an end of the pin with the threads of the collar out of engagement with the threads of the Chuck body and engagement of the other stop 27 with a pin end will occur when the two parts of the interrupted threads Within the collar are in engagement With the parts of the interruptedothreads on the chuck bod'v.

'i 'In order that the device may be readilyf assembled I provide an aperture 28 through the collar 24 of sufficient size to permit pas- To assemble thev sage of the stop pin 21. parts ofthe chuck the Cap 16 and jaw 17 A are removed and the stop block 18 is dropped in place. It is then .moved to bring aperture 19 in registration With the slots of the side Walls. The collar is positioned' and vthe pin inserted through the aperture 28 extendin through itthen through the rslot 14 throug the stop block and through the opposite slot intoplace.V A plug 29 isprovided to Close the aperture 28 if desired. lA smaller aperture 31 is provided diametrically opposite the aperture 28 to permit in'- ing out'of the stop pin sertion of a suitable implement to push the pin out through the aperture 28 rshould occasion require. Thereafter one or both of the 4stops 27 may be positioned.

' It will be noted from viewing Fig.' 4 that the stops 27 can be so arranged as to prevent the stop pin from alining Withfthe aperture 28 in the collar Whileboth stops 27 arein place. Such an arrangement prevents 'fall- 21 should the block 29 not be used.

It will be manifest that a chuck embodying my invention permits sensitivev adjustment of the stop by reason of the fact that the collar maybe lockedat any place on the chuckbody. 1 K

It is thought that the invention and many of its attendant advantages will be understood from the foregoing description, and it will be apparent'that various changes may be made in the form, constructionV and arrangement ofthe parts-Without departing from the 'spirit and scope of the invention I or sacrificing any of its materialadvantages,

the form hereinbefore described being merely a. preferred embodimentthereojf.

l C1afm:,f; o Y l. In a chuck, the combination of an axially bored head provided with .,oppo'sitely varranged longitudinally extending Slots', a 'stop extending through lsaid slots and out of lthehead at each side, and a collar rotatably embracing the ends of said stop, saidoollar being adapted to engage the head andliold the stop in desired position, said collar and stop *being lidably movable longitudinally of said head, and coperating threads on said collar and head for looking said Collar and stop in adjusted positions.V

2.*In a thunk, the Ycombination of an.

axially bored `headfprovidedWith oppositely arrangedE longitudinallyy extending slots, a stop extendingthrough said slotsland out of the head at each side,`and-a eollarrotatably embracing the ends ofsaid stop, said Collar beingadapted t0l engage'the head and hold head having engageable interrupted coperating'threads forlooking said stop in desired position.

In testimony whereof, Ii have lhereunto signed my name in the'presence of tivo subseribing lvvitnesses. l f HARRY B SIvIREV-E.' Witnessesff 'i H; DANGEL,

,BRENNANv 

